// 实现这个项目的构建任务
const { src, dest, parallel, series, watch } = require("gulp")
const del = require('del')
const loadPlugins = require('gulp-load-plugins')
const plugins = loadPlugins()

const browserSync = require('browser-sync')
const bs = browserSync.create()

const cwd = process.cwd()

const data = {
    menus: [
        {
            name: 'Home',
            icon: 'aperture',
            link: 'index.html'
        },
        {
            name: 'Features',
            link: 'features.html'
        },
        {
            name: 'About',
            link: 'about.html'
        },
        {
            name: 'Contact',
            link: '#',
            children: [
                {
                    name: 'Twitter',
                    link: 'https://twitter.com/w_zce'
                },
                {
                    name: 'About',
                    link: 'https://weibo.com/zceme'
                },
                {
                    name: 'divider'
                },
                {
                    name: 'About',
                    link: 'https://github.com/zce'
                }
            ]
        }
    ],
    pkg: require('./package.json'),
    date: new Date()
}

const styles = () => {
    return src("src/assets/styles/*.scss", { base: "src" })
        .pipe(plugins.sass({ outputStyle: 'expanded' }))
        .pipe(dest("temp"))
        .pipe(bs.reload({ stream: true }));
}

const scripts = () => {
    return src("src/assets/scripts/*.js", { base: "src" })
        .pipe(plugins.babel({ presets: [require('@babel/preset-env')] }))
        .pipe(dest("temp"))
        .pipe(bs.reload({ stream: true }));
}

const pages = () => {
    return src("src/*.html", { base: "src" })
        .pipe(plugins.swig({ data, defaults: { cache: false } }))// 防止模板缓存导致页面不能及时更新
        .pipe(dest("temp"))
        .pipe(bs.reload({ stream: true }));
}

const image = () => {
    return src('src/assets/images/**', { base: 'src' })
        .pipe(plugins.imagemin())
        .pipe(dest('dist'))
}

const font = () => {
    return src('src/assets/fonts/**', { base: 'src' })
        .pipe(plugins.imagemin())
        .pipe(dest('dist'))
}

const extra = () => {
    return src('public/**', { base: 'public' })
        .pipe(dest('dist'))
}

const useref = () => {
    return src("*.html", { base: "temp", cwd: "temp" })
        .pipe(plugins.useref({ searchPath: ["temp", '.'] }))
        // html js css
        .pipe(plugins.if(/\.js$/, plugins.uglify()))
        .pipe(plugins.if(/\.css$/, plugins.cleanCss()))
        .pipe(plugins.if(/\.html$/, plugins.htmlmin({
            collapseWhitespace: true,
            minifyCSS: true,
            minifyJS: true
        })))
        .pipe(dest("dist"))
}

const serve = () => {
    watch('src/assets/styles/*.scss', styles)
    watch('src/assets/scripts/*.js', scripts)
    watch('src/*.html', pages)
    // watch('src/assets/images/**', image)
    // watch('src/assets/fonts/**', font)
    // watch('public/**', extra)
    watch([
        'src/assets/images/**',
        'src/assets/fonts/**',
        'public/**'
    ], bs.reload)

    bs.init({
        port: 3080,
        server: {
            baseDir: ["temp", "dic", "public"],
            routes: {
                '/node_modules': 'node_modules'
            }
        }
    })
}

const clean = () => {
    return del(["dist", "temp"])
}

const compile = parallel(styles, scripts, pages)


// 上线之前执行的任务
const build = series(
    clean,
    parallel(
        series(compile, useref),
        image,
        font,
        extra
    )
)

const develop = series(compile, serve)

module.exports = {
    clean,
    build,
    develop
}
